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ANDROID: KVM: arm64: Factor out private range VA allocation

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__pkvm_create_private_mapping() is currently responsible for allocating
VA space in the hypervisor's "private" range and creating stage-1
mappings. In order to allow reusing the VA space allocation logic from
other places, let's factor it out in a standalone function.

Signed-off-by: Quentin Perret <qperret@google.com>
Bug: 209580772
Change-Id: I9cb82937931d272f9f61297a3f5dea0e039c2595
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Quentin Perret
2021-11-17 17:09:25 +00:00
committed by Will Deacon
parent 71a2987234
commit c9cc94723b
1 changed files with 19 additions and 9 deletions
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28
arch/arm64/kvm/hyp/nvhe/mm.c
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@@ -38,6 +38,22 @@ static int __pkvm_create_mappings(unsigned long start, unsigned long size,
return err;
}
static unsigned long hyp_alloc_private_va_range(size_t size)
{
unsigned long addr = __io_map_base;
hyp_assert_lock_held(&pkvm_pgd_lock);
__io_map_base += PAGE_ALIGN(size);
/* Are we overflowing on the vmemmap ? */
if (__io_map_base > __hyp_vmemmap) {
__io_map_base = addr;
addr = (unsigned long)ERR_PTR(-ENOMEM);
}
return addr;
}
unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
enum kvm_pgtable_prot prot)
{
@@ -46,16 +62,10 @@ unsigned long __pkvm_create_private_mapping(phys_addr_t phys, size_t size,
hyp_spin_lock(&pkvm_pgd_lock);
size = PAGE_ALIGN(size + offset_in_page(phys));
addr = __io_map_base;
__io_map_base += size;
/* Are we overflowing on the vmemmap ? */
if (__io_map_base > __hyp_vmemmap) {
__io_map_base -= size;
addr = (unsigned long)ERR_PTR(-ENOMEM);
size = size + offset_in_page(phys);
addr = hyp_alloc_private_va_range(size);
if (IS_ERR((void *)addr))
goto out;
}
err = kvm_pgtable_hyp_map(&pkvm_pgtable, addr, size, phys, prot);
if (err) {